Consider the polarizing transform \(K^{\otimes m}\) , where \(K\)  is an \(l \times l\)  polarization kernel, and bit subchannels \(W_{m}^{(i)}(y_0^{n-1},u_0^{i-1}|u_i)\) , induced by it. Let \(Z_m^{(i)} = Z(W_{m}^{(i)}(y_0^{n-1},u_0^{i-1}|u_i))\)  be a Bhattacharyya parameter of \(i\) -th subchannel, where \(i\)  is uniformly distributed on the set \([l^m]\) . Then, for any B-DMC \(W\)  with \(0<I(W)<1\) ,
we say that an \(l\times l\)  matrix \(K\)  has polarization rate \(E(K)\)  if [1]}
